The morphology and stratification of giant eddy bars reflect the variation in shape of palaeoflood hydrographs: A flume study,Earth Surface Processes and Landforms

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The morphology and stratification of giant eddy bars reflect the variation in shape of palaeoflood hydrographs: A flume study
Earth Surface Processes and Landforms ( IF 2.8 ) Pub Date : 2022-09-30 , DOI: 10.1002/esp.5488
Dingzhu Liu _{1,

2} , Paul A. Carling ₃ , Hao Wang ₁ , Weiming Liu ₄ , Yifei Cui ₅ , Chaohua Wu ₆ , Wen Jin ₇ , Nazir Ahmed Bazai ₈

Affiliation

Evidence for ungauged large freshwater palaeofloods in valley-confined landscapes frequently includes giant flow-eddy bars, deposited in alcoves along the floodway margins. Elevations of the bar tops commonly are used to define the minimum water level for computational flood simulations. Field study has shown that giant bar stratigraphy and sedimentology can be distinctive; identifying the alluvial signature of large palaeofloods where the morphological evidence may be less clear. However, whether the shape and stratigraphy of eddy bars provide indicators as to the nature of the floodwaves has not been considered widely. Flood hydrographs might be dam-break surge waves, gradually varied, or steady flows, for example. Yet, if bar form and stratigraphy vary systematically with the nature of the flood wave, then bars have additional value in defining the style of unrecorded floodwaves for environmental interpretation and flood modelling purposes.

中文翻译：

巨型涡流条的形态和分层反映了古洪水水位线形状的变化：一项水槽研究

在山谷限制的景观中，未测量的大型淡水古洪水的证据通常包括巨大的流动涡流坝，沉积在沿泄洪道边缘的壁龛中。坝顶高程通常用于定义计算洪水模拟的最低水位。野外研究表明，巨型沙坝的地层学和沉积学可以与众不同；确定形态学证据可能不太清楚的大型古洪水的冲积特征。然而，涡流棒的形状和地层学是否提供了洪水性质的指标尚未得到广泛考虑。例如，洪水过程线可能是溃坝涌浪、逐渐变化或稳定的流量。然而，如果沙坝形式和地层学随着洪水波的性质而系统地变化，

更新日期：2022-09-30

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